Why does my humidity controller have different settings based on outside temperature?
As it gets colder outside, the windows in the home have more opportunity to develop fogging or frosting. Resetting the humidity set point inside your house will reduce or eliminate this fogging. The suggestions on the humidity control are just that, suggestions. With some trial and error, a permanent setting can usually be found that allows comfort as well as no frosting. In most cases, if the home has more modern windows, this frosting isn’t a problem.
